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Top Forums UNIX for Advanced & Expert Users Checking response from a web page Post 302379708 by m1xram on Friday 11th of December 2009 03:17:24 PM
Old 12-11-2009
Not much to go on

You're trying to login so I realize you can't provide much detail but we don't know whether the page requires GET or POST method. The first method, GET, puts the information you supply into the URL. The second method, POST, puts the information into the header of the HTTP request.

If there's a login form on the web page you can look at the source HTML, find the form, see what method it uses, and what page it calls. Somewhere in the HTML something like the below code can be found unless there is also some crazy JavaScript going on.

Code:
<form method="POST" action="security_check">
<input type="text" name="username">
<input type="text" name="password"> 
<\form>

For the above page you would do something like...

Code:
wget -q --post-data 'username=happy&password=getin' 'http://xxx.xxxx.com/security_check'

A better way to find out what's happening exactly is to fire up WireShark, filter all HTTP transactions, login normally, and then look at the messages in WireShark.

Some pages are more of a pain than others. Some want the transactions to use SSL and some required cookies, that I've messed with. The worst pages were ones that did JavaScript page setup. I've never figured out how run the setup code from wget or curl on those type of pages.
 

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CURLOPT_POST(3) 					     curl_easy_setopt options						   CURLOPT_POST(3)

NAME
CURLOPT_POST - request a HTTP POST SYNOPSIS
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_POST, long post); DESCRIPTION
A parameter set to 1 tells libcurl to do a regular HTTP post. This will also make the library use a "Content-Type: application/x-www-form- urlencoded" header. (This is by far the most commonly used POST method). Use one of CURLOPT_POSTFIELDS(3) or CURLOPT_COPYPOSTFIELDS(3) options to specify what data to post and CURLOPT_POSTFIELDSIZE(3) or CUR- LOPT_POSTFIELDSIZE_LARGE(3) to set the data size. Optionally, you can provide data to POST using the CURLOPT_READFUNCTION(3) and CURLOPT_READDATA(3) options but then you must make sure to not set CURLOPT_POSTFIELDS(3) to anything but NULL. When providing data with a callback, you must transmit it using chunked transfer-encod- ing or you must set the size of the data with the CURLOPT_POSTFIELDSIZE(3) or CURLOPT_POSTFIELDSIZE_LARGE(3) options. To enable chunked encoding, you simply pass in the appropriate Transfer-Encoding header, see the post-callback.c example. You can override the default POST Content-Type: header by setting your own with CURLOPT_HTTPHEADER(3). Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" header. You can disable this header with CURLOPT_HTTPHEADER(3) as usual. If you use POST to a HTTP 1.1 server, you can send data without knowing the size before starting the POST if you use chunked encoding. You enable this by adding a header like "Transfer-Encoding: chunked" with CURLOPT_HTTPHEADER(3). With HTTP 1.0 or without chunked transfer, you must specify the size in the request. When setting CURLOPT_POST(3) to 1, it will automatically set CURLOPT_NOBODY(3) to 0. If you issue a POST request and then want to make a HEAD or GET using the same re-used handle, you must explicitly set the new request type using CURLOPT_NOBODY(3) or CURLOPT_HTTPGET(3) or similar. DEFAULT
0, disabled PROTOCOLS
HTTP EXAMPLE
TODO AVAILABILITY
Along with HTTP RETURN VALUE
Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not. SEE ALSO
CURLOPT_POSTFIELDS(3), CURLOPT_HTTPPOST(3), libcurl 7.54.0 February 03, 2016 CURLOPT_POST(3)
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